Malicious PDF — malware analysis report

Static analysis result for SHA-256 137f625cc0ec09b7…

MALICIOUS

PDF

41.4 KB Created: 2020-08-17 11:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75857f0ac48447fa2b920aa202498c10 SHA-1: c615acc2ad3c7056a1178d44bdf9f3bcea3eca8a SHA-256: 137f625cc0ec09b74e7bd260156b65a9d50259da6f1c616649e8beb2471ac477
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=game+offline+pc++free'. This suggests a phishing or scam attempt, likely using a lure related to free PC games. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of many links and the malicious redirector are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=game+offline+pc++free
    • http://files.helenabergerdirector.com/uploads/1/3/0/7/130739081/netelifomukuxuw.pdf
    • http://files.friendsonthegotravel.com/uploads/1/3/1/8/131871642/zerukuwevisosex_tugozej.pdf
    • http://suvun.mkirbymoore.com/uploads/1/3/1/6/131607131/kitedixavofu.pdf
    • http://nizuka.ourfathersfarmusa.com/uploads/1/3/0/7/130739267/80c6aab4b117b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/19639639152.pdf
    • https://cdn.shopify.com/s/files/1/0452/5237/8784/files/accountant_interview_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/81764246760.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/60115529192.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/kuveko.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/gabojibenokabowesokora.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/lutejujawezefumiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/98855057761.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/tinoxipolabafupazik.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/grammar_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0451/3605/2389/files/dozeziluwefoma.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ee.bin
6d0fd0c31aee1564aa0929972335fbbcd1ed6497855a360f73e8d4d7ed869067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 5012 bytes
font_01_sfnt_off000075ee.bin
7a3c03eec4d3b4ad9dd369071b84752282dbfc9dc346c4f931ad62ce3e60104c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EE 10236 bytes

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